Noah is currently dating actor and singer Ben Platt — who notably had the role of Evan Hansen in the Broadway version of Dear Evan Hansen that the movie is based on. Ben portrayed the titular character on Broadway from December 2016 to November 2017, before stepping away from the role, then reprising it in the 2021 film adaptation. Interestingly, Noah stepped in as a temporary replacement for the part of Evan on Broadway from late November 2017 to early February 2018.

Noah and Ben were actually friends for a while before they became romantically involved, Ben told Kelly Clarkson in June 2021. "We were friends for five years and right before the pandemic, we finally decided to really give it a shot," he said of their relationship. "We kind of skated around it for a long time."

But when the COVID-19 pandemic shut down much of the U.S., Ben and Noah went from "zero to 60" as they started living together with Ben's parents in his childhood home. "It ended up being a beautiful time," Ben explained. "Being inside, being in the same room for like a year… He made it feel really magical and special."

Ben and Noah were finally able to make their relationship "red-carpet official" when they attended the Dear Evan Hansen premiere on Sept. 22, 2021, in Los Angeles.